System and method for conserving battery energy in a wireless telephone with an integral global positioning system

Claim 2

A wireless telephone for use in a wireless communications network, said wireless telephone comprising: a transceiver configured to establish and maintain communication with said wireless communications network; a global positioning system (GPS) receiver configured to acquire short term and long term information used in making position determinations; and a controller connected to the transceiver and the GPS receiver, said controller configured to periodically actuate the GPS receiver to acquire short term and long term information at selected time intervals and further configured to alter the time intervals of the periodic actuation of the GPS receiver and the acquisition of said short term and long term information responsive to the wireless telephone's operating conditions.

Claim 3

The wireless telephone of claim 1 wherein the controller causes the GPS receiver to immediately acquire short term information responsive to the transceiver's receipt of the paging message.

Claim 4

The wireless telephone of claim 1 wherein said wireless telephone further includes a keypad connected to the controller and wherein the controller causes the GPS receiver to immediately acquire short term information responsive to general keypad manipulation.

Claim 5

The wireless telephone of claim 1 wherein said transceiver is adapted to make signal strength measurements of a predefined signal from the wireless network, and wherein said controller is further configured to affect acquisition of said short term and long term information responsive to the signal strength measurements.

Claim 6

The wireless telephone of claim 4 wherein said controller is configured to actuate the GPS receiver to immediately obtain short-term information responsive to the signal strength increasing.

Claim 7

The wireless telephone of claim 4 wherein said controller is configured to skip at least one of said periodic acquisitions of short term information responsive to the signal strength measurements being below a threshold.

Claim 8

The wireless telephone of claim 4 wherein said controller is configured to skip at least one of said periodic acquisitions of short-term information responsive to the signal strength measurements decreasing.

Claim 9

The wireless telephone of claim 4 wherein said controller is configured to delay at least one of said periodic acquisitions of long term information responsive to the signal strength measurements being below a threshold.

Claim 10

The wireless telephone of claim 4 wherein said controller is configured to delay at least one of said periodic acquisitions of long term information responsive to the signal strength measurement decreasing.

Claim 11

The wireless telephone of claim 4 wherein said controller is configured to abort acquisition of long term information responsive to the measured signal strength decreasing rapidly.

Claim 12

The wireless telephone of claim 1 wherein said controller is adapted to determine motion of said wireless telephone by comparing short term information and wherein the period of acquisition of short term information is lengthened if the wireless telephone is stationary.

Claim 13

The wireless telephone of claim 1 wherein said controller is adapted to determine motion of said wireless telephone by comparing short term information and wherein the period of acquisition of short term information is shortened if the wireless telephone is moving.

Claim 14

In a wireless telephone powered by a battery and having a wireless communication transceiver responsive to a plurality of events for establishing and maintaining communication and a global positioning system (GPS) receiver that obtains short term and long term information for position calculations based in part on the short term and long term information, said GPS receiver having an "on" state where it draws battery power and an "off" state where it does not draw battery power, a method for preserving battery energy when said wireless telephone is in a standby mode while maintaining short term and long term information for making a prompt and accurate position determination, said method comprising: acquiring short term information at selected time intervals by: (a) changing said GPS receiver to said "on" state; (b) obtaining a set of short-term information measurements; (c) changing said GPS receiver to said "off" state; (d) repeating steps (a) through (c) at the selected time intervals; and altering time intervals based on events in the wireless telephone.

Claim 15

In a wireless telephone powered by a battery and having a wireless communication transceiver responsive to a plurality of events for establishing and maintaining communication and a global positioning system (GPS) receiver that obtains short term and long term information for position calculations based in part on the short term and long term information, said GPS receiver having an "on" state where it draws battery power and an "off" state where it does not draw battery power, a method for preserving battery energy when said wireless telephone is in a standby mode while maintaining short term and long term information for making a prompt and accurate position determination, said method comprising: acquiring short term information at selected time intervals by: (a) changing said GPS receiver to said "on" state; (b) obtaining a set of short-term information measurements; (c) changing said GPS receiver to said "off" state; (d) repeating steps (a) through (c) at the selected time intervals; and altering time intervals based on events in the wireless telephone.

Claim 16

The method of claim 13 wherein the short-term information is immediately acquired responsive to receipt of a paging message at said wireless communication transceiver.

Claim 17

The method of claim 13 wherein the wireless telephone includes a keypad, and wherein one of the events comprises receipt of a paging message at said wireless communication transceiver; wherein the short term information is immediately acquired responsive to general keypad manipulation.

Claim 18

The method of claim 13 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein short term information is immediately acquired responsive to an increase in the signal strength.

Claim 19

The method of claim 13 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein short term information is acquired less frequently responsive to a decrease in the signal strength.

Claim 20

The method of claim 13 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein short term information is acquired less frequently responsive to the signal strength remaining below a threshold.

Claim 21

The method of claim 13 further including comparing short term information and wherein the short term information is acquired less frequently responsive to little or no change in the position of the wireless telephone.

Claim 22

The method of claim 13 further including comparing short term information and wherein the short term information is acquired more frequently responsive to change in the position of the wireless telephone.

Claim 23

In a wireless telephone powered by a battery and having a wireless communication transceiver responsive to a plurality of events for establishing and maintaining communication and a global positioning system (GPS) receiver that obtains short term and long term information for position calculations based in part on the short term and long term information, said GPS receiver having an "on" state where it draws battery power and an "off" state where it does not draw battery power, a method for preserving battery energy when said wireless telephone is in a standby mode while maintaining short term and long term information for making a rapid GPS position determination, said method comprising: acquiring long term information at selected time intervals by: (a) changing said GPS receiver to said "on" state; (b) obtaining long term information; (c) changing said GPS receiver to said "off" state; (d) repeating steps (a) through (c) at the selected time intervals; and altering the time intervals based on events in the wireless communication transceiver.

Claim 24

In a wireless telephone powered by a battery and having a wireless communication transceiver responsive to a plurality of events for establishing and maintaining communication and a global positioning system (GPS) receiver that obtains short term and long term information for position calculations based in part on the short term and long term information, said GPS receiver having an "on" state where it draws battery power and an "off" state where it does not draw battery power, a method for preserving battery energy when said wireless telephone is in a standby mode while maintaining short term and long term information for making a rapid GPS position determination, said method comprising: acquiring long term information at selected time intervals by: (a) changing said GPS receiver to said "on" state; (b) obtaining long term information; (c) changing said GPS receiver to said "off" state; (d) repeating steps (a) through (c) at the selected time intervals; and altering the time intervals based on events in the wireless communication transceiver.

Claim 25

The method of claim 21 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein the acquisition of long term information is aborted responsive to a rapid decrease in the received signal strength indication.

Claim 26

The method of claim 21 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein the acquisition of long term information is delayed responsive to a decrease in the received signal strength indication.

Claim 27

The method of claim 21 wherein the wireless communication transceiver makes signal strength measurements of a signal from the wireless network, and wherein the acquisition of long term information is delayed responsive to the received signal strength indication remaining below a threshold.